Empty array

JavaScript performance comparison

Revision 26 of this test case created by eTagTechnologies.Inc

Preparation code

<div id="lbl">?</div>
<script>
Benchmark.prototype.setup = function() {
    var arr = [{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"},{a: 1, b: "2"}];
};
</script>

Preparation code output

?

Test runner

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Testing in unknown unknown
Test Ops/sec
length
arr.length = 0;
pending…
splice
arr.splice(0, arr.length);
pending…
pop
var l = arr.length;
for(var i = 0; i < l; i++) {
 arr.pop();
}
 
pending…
shift
var l = arr.length;
for(var i = 0; i < l; i++) {
 arr.shift();
}
pending…
pop reverse while
var i = arr.length;
while (i--) {
  arr.pop();
}
pending…

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